mirror of
https://github.com/AutoMaker-Org/automaker.git
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refactor: eliminate code duplication with shared utilities
Created 5 new utility modules in apps/server/src/lib/ to eliminate ~320 lines of duplicated code: - image-handler.ts: Centralized image processing (MIME types, base64, content blocks) - prompt-builder.ts: Standardized prompt building with image attachments - model-resolver.ts: Model alias resolution and provider routing - conversation-utils.ts: Conversation history processing for providers - error-handler.ts: Error classification and user-friendly messages Updated services and providers to use shared utilities: - agent-service.ts: -51 lines (removed duplicate image handling, model logic) - auto-mode-service.ts: -75 lines (removed MODEL_MAP, duplicate utilities) - claude-provider.ts: -10 lines (uses conversation-utils) - codex-provider.ts: -5 lines (uses conversation-utils) Added comprehensive documentation: - docs/server/utilities.md: Complete reference for all 9 lib utilities - docs/server/providers.md: Provider architecture guide with examples Benefits: - Single source of truth for critical business logic - Improved maintainability and testability - Consistent behavior across services and providers - Better documentation for future development 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Kacper
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docs/server/utilities.md
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# Server Utilities Reference
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This document describes all utility modules available in `apps/server/src/lib/`. These utilities provide reusable functionality for image handling, prompt building, model resolution, conversation management, and error handling.
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---
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## Table of Contents
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1. [Image Handler](#image-handler)
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2. [Prompt Builder](#prompt-builder)
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3. [Model Resolver](#model-resolver)
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4. [Conversation Utils](#conversation-utils)
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5. [Error Handler](#error-handler)
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6. [Subprocess Manager](#subprocess-manager)
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7. [Events](#events)
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8. [Auth](#auth)
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9. [Security](#security)
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---
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## Image Handler
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**Location**: `apps/server/src/lib/image-handler.ts`
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Centralized utilities for processing image files, including MIME type detection, base64 encoding, and content block generation for Claude SDK format.
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### Functions
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#### `getMimeTypeForImage(imagePath: string): string`
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Get MIME type for an image file based on its extension.
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**Supported formats**:
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- `.jpg`, `.jpeg` → `image/jpeg`
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- `.png` → `image/png`
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- `.gif` → `image/gif`
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- `.webp` → `image/webp`
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- Default: `image/png`
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**Example**:
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```typescript
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import { getMimeTypeForImage } from "../lib/image-handler.js";
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const mimeType = getMimeTypeForImage("/path/to/image.jpg");
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// Returns: "image/jpeg"
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```
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---
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#### `readImageAsBase64(imagePath: string): Promise<ImageData>`
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Read an image file and convert to base64 with metadata.
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**Returns**: `ImageData`
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```typescript
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interface ImageData {
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base64: string; // Base64-encoded image data
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mimeType: string; // MIME type
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filename: string; // File basename
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originalPath: string; // Original file path
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}
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```
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**Example**:
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```typescript
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const imageData = await readImageAsBase64("/path/to/photo.png");
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console.log(imageData.base64); // "iVBORw0KG..."
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console.log(imageData.mimeType); // "image/png"
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console.log(imageData.filename); // "photo.png"
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```
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---
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#### `convertImagesToContentBlocks(imagePaths: string[], workDir?: string): Promise<ImageContentBlock[]>`
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Convert image paths to content blocks in Claude SDK format. Handles both relative and absolute paths.
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**Parameters**:
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- `imagePaths` - Array of image file paths
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- `workDir` - Optional working directory for resolving relative paths
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**Returns**: Array of `ImageContentBlock`
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```typescript
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interface ImageContentBlock {
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type: "image";
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source: {
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type: "base64";
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media_type: string;
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data: string;
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};
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}
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```
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**Example**:
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```typescript
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const imageBlocks = await convertImagesToContentBlocks(
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["./screenshot.png", "/absolute/path/diagram.jpg"],
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"/project/root"
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);
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// Use in prompt content
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const contentBlocks = [
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{ type: "text", text: "Analyze these images:" },
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...imageBlocks
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];
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```
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---
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#### `formatImagePathsForPrompt(imagePaths: string[]): string`
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Format image paths as a bulleted list for inclusion in text prompts.
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**Returns**: Formatted string with image paths, or empty string if no images.
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**Example**:
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```typescript
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const pathsList = formatImagePathsForPrompt([
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"/screenshots/login.png",
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"/diagrams/architecture.png"
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]);
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// Returns:
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// "\n\nAttached images:\n- /screenshots/login.png\n- /diagrams/architecture.png\n"
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```
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---
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## Prompt Builder
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**Location**: `apps/server/src/lib/prompt-builder.ts`
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Standardized prompt building that combines text prompts with image attachments.
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### Functions
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#### `buildPromptWithImages(basePrompt: string, imagePaths?: string[], workDir?: string, includeImagePaths: boolean = false): Promise<PromptWithImages>`
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Build a prompt with optional image attachments.
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**Parameters**:
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- `basePrompt` - The text prompt
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- `imagePaths` - Optional array of image file paths
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- `workDir` - Optional working directory for resolving relative paths
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- `includeImagePaths` - Whether to append image paths to the text (default: false)
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**Returns**: `PromptWithImages`
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```typescript
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interface PromptWithImages {
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content: PromptContent; // string | Array<ContentBlock>
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hasImages: boolean;
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}
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type PromptContent = string | Array<{
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type: string;
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text?: string;
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source?: object;
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}>;
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```
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**Example**:
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```typescript
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import { buildPromptWithImages } from "../lib/prompt-builder.js";
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// Without images
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const { content } = await buildPromptWithImages("What is 2+2?");
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// content: "What is 2+2?" (simple string)
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// With images
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const { content, hasImages } = await buildPromptWithImages(
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"Analyze this screenshot",
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["/path/to/screenshot.png"],
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"/project/root",
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true // include image paths in text
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);
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// content: [
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// { type: "text", text: "Analyze this screenshot\n\nAttached images:\n- /path/to/screenshot.png\n" },
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// { type: "image", source: { type: "base64", media_type: "image/png", data: "..." } }
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// ]
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// hasImages: true
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```
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**Use Cases**:
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- **AgentService**: Set `includeImagePaths: true` to list paths for Read tool access
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- **AutoModeService**: Set `includeImagePaths: false` to avoid duplication in feature descriptions
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---
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## Model Resolver
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**Location**: `apps/server/src/lib/model-resolver.ts`
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Centralized model string mapping and resolution for handling model aliases and provider detection.
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### Constants
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#### `CLAUDE_MODEL_MAP`
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Model alias mapping for Claude models.
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```typescript
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export const CLAUDE_MODEL_MAP: Record<string, string> = {
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haiku: "claude-haiku-4-5",
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sonnet: "claude-sonnet-4-20250514",
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opus: "claude-opus-4-5-20251101",
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} as const;
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```
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#### `DEFAULT_MODELS`
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Default models per provider.
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```typescript
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export const DEFAULT_MODELS = {
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claude: "claude-opus-4-5-20251101",
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openai: "gpt-5.2",
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} as const;
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```
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### Functions
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#### `resolveModelString(modelKey?: string, defaultModel: string = DEFAULT_MODELS.claude): string`
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Resolve a model key/alias to a full model string.
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**Logic**:
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1. If `modelKey` is undefined → return `defaultModel`
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2. If starts with `"gpt-"` or `"o"` → pass through (OpenAI/Codex model)
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3. If includes `"claude-"` → pass through (full Claude model string)
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4. If in `CLAUDE_MODEL_MAP` → return mapped value
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5. Otherwise → return `defaultModel` with warning
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**Example**:
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```typescript
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import { resolveModelString, DEFAULT_MODELS } from "../lib/model-resolver.js";
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resolveModelString("opus");
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// Returns: "claude-opus-4-5-20251101"
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// Logs: "[ModelResolver] Resolved model alias: "opus" -> "claude-opus-4-5-20251101""
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resolveModelString("gpt-5.2");
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// Returns: "gpt-5.2"
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// Logs: "[ModelResolver] Using OpenAI/Codex model: gpt-5.2"
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resolveModelString("claude-sonnet-4-20250514");
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// Returns: "claude-sonnet-4-20250514"
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// Logs: "[ModelResolver] Using full Claude model string: claude-sonnet-4-20250514"
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resolveModelString("invalid-model");
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// Returns: "claude-opus-4-5-20251101"
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// Logs: "[ModelResolver] Unknown model key "invalid-model", using default: "claude-opus-4-5-20251101""
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```
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---
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#### `getEffectiveModel(explicitModel?: string, sessionModel?: string, defaultModel?: string): string`
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Get the effective model from multiple sources with priority.
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**Priority**: explicit model > session model > default model
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**Example**:
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```typescript
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import { getEffectiveModel } from "../lib/model-resolver.js";
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// Explicit model takes precedence
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getEffectiveModel("sonnet", "opus");
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// Returns: "claude-sonnet-4-20250514"
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// Falls back to session model
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getEffectiveModel(undefined, "haiku");
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// Returns: "claude-haiku-4-5"
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// Falls back to default
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getEffectiveModel(undefined, undefined, "gpt-5.2");
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// Returns: "gpt-5.2"
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```
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---
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## Conversation Utils
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**Location**: `apps/server/src/lib/conversation-utils.ts`
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Standardized conversation history processing for both SDK-based and CLI-based providers.
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### Types
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```typescript
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import type { ConversationMessage } from "../providers/types.js";
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interface ConversationMessage {
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role: "user" | "assistant";
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content: string | Array<{ type: string; text?: string; source?: object }>;
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}
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```
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### Functions
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#### `extractTextFromContent(content: string | Array<ContentBlock>): string`
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Extract plain text from message content (handles both string and array formats).
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**Example**:
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```typescript
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import { extractTextFromContent } from "../lib/conversation-utils.js";
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// String content
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extractTextFromContent("Hello world");
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// Returns: "Hello world"
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// Array content
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extractTextFromContent([
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{ type: "text", text: "Hello" },
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{ type: "image", source: {...} },
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{ type: "text", text: "world" }
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]);
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// Returns: "Hello\nworld"
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```
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---
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#### `normalizeContentBlocks(content: string | Array<ContentBlock>): Array<ContentBlock>`
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Normalize message content to array format.
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**Example**:
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```typescript
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// String → array
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normalizeContentBlocks("Hello");
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// Returns: [{ type: "text", text: "Hello" }]
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// Array → pass through
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normalizeContentBlocks([{ type: "text", text: "Hello" }]);
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// Returns: [{ type: "text", text: "Hello" }]
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```
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---
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#### `formatHistoryAsText(history: ConversationMessage[]): string`
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Format conversation history as plain text for CLI-based providers (e.g., Codex).
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**Returns**: Formatted text with role labels, or empty string if no history.
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**Example**:
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```typescript
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const history = [
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{ role: "user", content: "What is 2+2?" },
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{ role: "assistant", content: "2+2 equals 4." }
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];
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const formatted = formatHistoryAsText(history);
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// Returns:
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// "Previous conversation:
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//
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// User: What is 2+2?
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//
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// Assistant: 2+2 equals 4.
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//
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// ---
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//
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// "
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```
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---
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#### `convertHistoryToMessages(history: ConversationMessage[]): Array<SDKMessage>`
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Convert conversation history to Claude SDK message format.
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**Returns**: Array of SDK-formatted messages ready to yield in async generator.
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**Example**:
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```typescript
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const history = [
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{ role: "user", content: "Hello" },
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{ role: "assistant", content: "Hi there!" }
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];
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const messages = convertHistoryToMessages(history);
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// Returns:
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// [
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// {
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// type: "user",
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// session_id: "",
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// message: {
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// role: "user",
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// content: [{ type: "text", text: "Hello" }]
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// },
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// parent_tool_use_id: null
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// },
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// {
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// type: "assistant",
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// session_id: "",
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// message: {
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// role: "assistant",
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// content: [{ type: "text", text: "Hi there!" }]
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// },
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// parent_tool_use_id: null
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// }
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// ]
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```
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---
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## Error Handler
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**Location**: `apps/server/src/lib/error-handler.ts`
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Standardized error classification and handling utilities.
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### Types
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```typescript
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export type ErrorType = "authentication" | "abort" | "execution" | "unknown";
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export interface ErrorInfo {
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type: ErrorType;
|
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message: string;
|
||||
isAbort: boolean;
|
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isAuth: boolean;
|
||||
originalError: unknown;
|
||||
}
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```
|
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### Functions
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||||
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#### `isAbortError(error: unknown): boolean`
|
||||
|
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Check if an error is an abort/cancellation error.
|
||||
|
||||
**Example**:
|
||||
```typescript
|
||||
import { isAbortError } from "../lib/error-handler.js";
|
||||
|
||||
try {
|
||||
// ... operation
|
||||
} catch (error) {
|
||||
if (isAbortError(error)) {
|
||||
console.log("Operation was cancelled");
|
||||
return { success: false, aborted: true };
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
#### `isAuthenticationError(errorMessage: string): boolean`
|
||||
|
||||
Check if an error is an authentication/API key error.
|
||||
|
||||
**Detects**:
|
||||
- "Authentication failed"
|
||||
- "Invalid API key"
|
||||
- "authentication_failed"
|
||||
- "Fix external API key"
|
||||
|
||||
**Example**:
|
||||
```typescript
|
||||
if (isAuthenticationError(error.message)) {
|
||||
console.error("Please check your API key configuration");
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
#### `classifyError(error: unknown): ErrorInfo`
|
||||
|
||||
Classify an error into a specific type.
|
||||
|
||||
**Example**:
|
||||
```typescript
|
||||
import { classifyError } from "../lib/error-handler.js";
|
||||
|
||||
try {
|
||||
// ... operation
|
||||
} catch (error) {
|
||||
const errorInfo = classifyError(error);
|
||||
|
||||
switch (errorInfo.type) {
|
||||
case "authentication":
|
||||
// Handle auth errors
|
||||
break;
|
||||
case "abort":
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||||
// Handle cancellation
|
||||
break;
|
||||
case "execution":
|
||||
// Handle other errors
|
||||
break;
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
#### `getUserFriendlyErrorMessage(error: unknown): string`
|
||||
|
||||
Get a user-friendly error message.
|
||||
|
||||
**Example**:
|
||||
```typescript
|
||||
try {
|
||||
// ... operation
|
||||
} catch (error) {
|
||||
const friendlyMessage = getUserFriendlyErrorMessage(error);
|
||||
// "Operation was cancelled" for abort errors
|
||||
// "Authentication failed. Please check your API key." for auth errors
|
||||
// Original error message for other errors
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Subprocess Manager
|
||||
|
||||
**Location**: `apps/server/src/lib/subprocess-manager.ts`
|
||||
|
||||
Utilities for spawning CLI processes and parsing JSONL streams (used by Codex provider).
|
||||
|
||||
### Types
|
||||
|
||||
```typescript
|
||||
export interface SubprocessOptions {
|
||||
command: string;
|
||||
args: string[];
|
||||
cwd: string;
|
||||
env?: Record<string, string>;
|
||||
abortController?: AbortController;
|
||||
timeout?: number; // Milliseconds of no output before timeout
|
||||
}
|
||||
|
||||
export interface SubprocessResult {
|
||||
stdout: string;
|
||||
stderr: string;
|
||||
exitCode: number | null;
|
||||
}
|
||||
```
|
||||
|
||||
### Functions
|
||||
|
||||
#### `async function* spawnJSONLProcess(options: SubprocessOptions): AsyncGenerator<unknown>`
|
||||
|
||||
Spawns a subprocess and streams JSONL output line-by-line.
|
||||
|
||||
**Features**:
|
||||
- Parses each line as JSON
|
||||
- Handles abort signals
|
||||
- 30-second timeout detection for hanging processes
|
||||
- Collects stderr for error reporting
|
||||
- Continues processing other lines if one fails to parse
|
||||
|
||||
**Example**:
|
||||
```typescript
|
||||
import { spawnJSONLProcess } from "../lib/subprocess-manager.js";
|
||||
|
||||
const stream = spawnJSONLProcess({
|
||||
command: "codex",
|
||||
args: ["exec", "--model", "gpt-5.2", "--json", "--full-auto", "Fix the bug"],
|
||||
cwd: "/project/path",
|
||||
env: { OPENAI_API_KEY: "sk-..." },
|
||||
abortController: new AbortController(),
|
||||
timeout: 30000
|
||||
});
|
||||
|
||||
for await (const event of stream) {
|
||||
console.log("Received event:", event);
|
||||
// Process JSONL events
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
#### `async function spawnProcess(options: SubprocessOptions): Promise<SubprocessResult>`
|
||||
|
||||
Spawns a subprocess and collects all output.
|
||||
|
||||
**Example**:
|
||||
```typescript
|
||||
const result = await spawnProcess({
|
||||
command: "git",
|
||||
args: ["status"],
|
||||
cwd: "/project/path"
|
||||
});
|
||||
|
||||
console.log(result.stdout); // Git status output
|
||||
console.log(result.exitCode); // 0 for success
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Events
|
||||
|
||||
**Location**: `apps/server/src/lib/events.ts`
|
||||
|
||||
Event emitter system for WebSocket communication.
|
||||
|
||||
**Documented separately** - see existing codebase for event types and usage.
|
||||
|
||||
---
|
||||
|
||||
## Auth
|
||||
|
||||
**Location**: `apps/server/src/lib/auth.ts`
|
||||
|
||||
Authentication utilities for API endpoints.
|
||||
|
||||
**Documented separately** - see existing codebase for authentication flow.
|
||||
|
||||
---
|
||||
|
||||
## Security
|
||||
|
||||
**Location**: `apps/server/src/lib/security.ts`
|
||||
|
||||
Security utilities for input validation and sanitization.
|
||||
|
||||
**Documented separately** - see existing codebase for security patterns.
|
||||
|
||||
---
|
||||
|
||||
## Best Practices
|
||||
|
||||
### When to Use Which Utility
|
||||
|
||||
1. **Image handling** → Always use `image-handler.ts` utilities
|
||||
- ✅ Do: `convertImagesToContentBlocks(imagePaths, workDir)`
|
||||
- ❌ Don't: Manually read files and encode base64
|
||||
|
||||
2. **Prompt building** → Use `prompt-builder.ts` for consistency
|
||||
- ✅ Do: `buildPromptWithImages(text, images, workDir, includePathsInText)`
|
||||
- ❌ Don't: Manually construct content block arrays
|
||||
|
||||
3. **Model resolution** → Use `model-resolver.ts` for all model handling
|
||||
- ✅ Do: `resolveModelString(feature.model, DEFAULT_MODELS.claude)`
|
||||
- ❌ Don't: Inline model mapping logic
|
||||
|
||||
4. **Error handling** → Use `error-handler.ts` for classification
|
||||
- ✅ Do: `if (isAbortError(error)) { ... }`
|
||||
- ❌ Don't: `if (error instanceof AbortError || error.name === "AbortError") { ... }`
|
||||
|
||||
### Importing Utilities
|
||||
|
||||
Always use `.js` extension in imports for ESM compatibility:
|
||||
|
||||
```typescript
|
||||
// ✅ Correct
|
||||
import { buildPromptWithImages } from "../lib/prompt-builder.js";
|
||||
|
||||
// ❌ Incorrect
|
||||
import { buildPromptWithImages } from "../lib/prompt-builder";
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Testing Utilities
|
||||
|
||||
When writing tests for utilities:
|
||||
|
||||
1. **Unit tests** - Test each function in isolation
|
||||
2. **Integration tests** - Test utilities working together
|
||||
3. **Mock external dependencies** - File system, child processes
|
||||
|
||||
Example:
|
||||
```typescript
|
||||
describe("image-handler", () => {
|
||||
it("should detect MIME type correctly", () => {
|
||||
expect(getMimeTypeForImage("photo.jpg")).toBe("image/jpeg");
|
||||
expect(getMimeTypeForImage("diagram.png")).toBe("image/png");
|
||||
});
|
||||
});
|
||||
```
|
||||
Reference in New Issue
Block a user